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Two-weight weak type maximal inequalities in Orlicz classes

Luboš Pick (1991)

Studia Mathematica

Necessary and sufficient conditions are shown in order that the inequalities of the form ϱ ( M μ f > λ ) Φ ( λ ) C ʃ X Ψ ( C | f ( x ) | ) σ ( x ) d μ , or ϱ ( M μ f > λ ) C ʃ X Φ ( C λ - 1 | f ( x ) | ) σ ( x ) d μ hold with some positive C independent of λ > 0 and a μ-measurable function f, where (X,μ) is a space with a complete doubling measure μ, M μ is the maximal operator with respect to μ, Φ, Ψ are arbitrary Young functions, and ϱ, σ are weights, not necessarily doubling.

Two-weighted criteria for integral transforms with multiple kernels

Vakhtang Kokilashvili, Alexander Meskhi (2006)

Banach Center Publications

Necessary and sufficient conditions governing two-weight L p norm estimates for multiple Hardy and potential operators are presented. Two-weight inequalities for potentials defined on nonhomogeneous spaces are also discussed. Sketches of the proofs for most of the results are given.

Ultrapowers of Köthe function spaces.

Yves Raynaud (1997)

Collectanea Mathematica

The ultrapowers, relative to a fixed ultrafilter, of all the Köthe function spaces with non trivial concavity over the same measure space can be represented as Köthe function spaces over the same (enlarged) measure space. The existence of a uniform homeomorphism between the unit spheres of two such Köthe function spaces is reproved.

Un critère de tension dans les espaces de Besov-Orlicz et applications au problème du temps d’occupation

Mohamed Ait Ouahra, Abdelghani Kissami, Aissa Sghir (2011)

Annales mathématiques Blaise Pascal

Dans ce travail, nous présentons une nouvelle caractérisation de la norme des espaces de Besov-Orlicz associés à la 𝒩 -fonction exponentielle M β pour β > 0 . Nous utilisons cette nouvelle norme et un lemme de Marcus et Pisier [15], pour démontrer un critère de tension et de régularité dans les espaces de Besov-Orlicz pour β 1 . Nous étudions ensuite dans les espaces de Besov-Orlicz pour β = 1 , des théorèmes limites pour les mesures d’occupations du temps local du processus stable symétrique d’indice 1 < α 2 , ce qui...

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